This is a protective guard that slips over the power button on the newer style light curtain poles.

The switches are hard to feel through the rubber cap so there is potential to damage them.

Adding this item does two things, it prevents the switch being pressed in too far protecting it, and also adds the feeling of a stop to the rubber cover when it is pushed.

Creality

Ender 3

No

No

no

Basically anything works!